This invention relates to implants formed from donor bone for use in lumbar interbody fusion procedures and instruments for performing such procedures. The implants are formed to include a concave surface formed from a portion of the medullary canal of a long bone. The concaved surface defines a recess...http://www.google.de/patents/US20050261681?utm_source=gb-gplus-sharePatent US20050261681 - INTERBODY FUSION GRAFTS AND INSTRUMENTATION
